It would be useful for us if we could send a switch argument
to ShowHelp() that would produce a popup with the called ID for a
CSH call. That shouldn't be too hard to add in and would be
extremely useful.

I assume you want this only for development. It sounds like
the BugHunter tool in RoboHelp. When a context sensitive help call
is made, BugHunter shows the call and the map numbers. Microsoft's
Help Workshop can also do this. The caveat is that Robohelp (or
Help Workshop) needs to be running when you are running the
application for this to work.

Ah, WebHelp. I don't think BugHunter works with WebHelp
either but maybe the WebHelp huys on this forum will be able to
answer that. If it doesn't, you might want to make that as a
feature request to Adobe.